obs-ffmpeg: Remove obsolete translations

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A commit 4e140d2ff added AMF error messages but they were never used.
A commit 45d029b1f removed some code but a translation key "Advanced"
was left.
A commit 77fbfbe5c removed code to translate NVENC.TooManyBFrames but
the translation key was left.
A commit 6cc7cf3d5 removed the code to select codecs but the translation
was left.

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